package com.eryos.android.cigarettecounter.io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;

/**
 * Project :  CigaretteCounter
 * Author :   Olivier Combe 
 * URL :      http://eryos.fr/CigaretteCounter/
 *
 * Copyright (C) 2011 - Olivier Combe 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 */

// Code from: http://lukencode.com/2010/04/27/calling-web-services-in-android-using-httpclient/
public class RestClient {

	public enum RequestMethod{ GET, POST }

	private ArrayList<NameValuePair> params;
	private ArrayList<NameValuePair> headers;

	private String url;

	private int responseCode;
	private String message;

	private String response;

	/**
	 * 
	 * @param url
	 */
	public RestClient(String url) {
		this.url = url;
		params = new ArrayList<NameValuePair>();
		headers = new ArrayList<NameValuePair>();
	}

	/**
	 * 
	 * @param name
	 * @param value
	 */
	public void AddParam(String name, String value) {
		params.add(new BasicNameValuePair(name, value));
	}

	/**
	 * 
	 * @param name
	 * @param value
	 */
	public void AddHeader(String name, String value) {
		headers.add(new BasicNameValuePair(name, value));
	}

	/**
	 * 
	 * @param method
	 * @throws Exception
	 */
	public void Execute(RequestMethod method) throws Exception {
		switch (method) {
		case GET: {
			// add parameters
			String combinedParams = "";
			if (!params.isEmpty()){
				combinedParams += "?";
				for (NameValuePair p : params){
					String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
					if (combinedParams.length() > 1){
						combinedParams += "&" + paramString;
					}else{
						combinedParams += paramString;
					}
				}
			}

			HttpGet request = new HttpGet(url + combinedParams);

			// add headers
			for (NameValuePair h : headers){
				request.addHeader(h.getName(), h.getValue());
			}

			executeRequest(request, url);
			break;
		}
		case POST: {
			HttpPost request = new HttpPost(url);

			// add headers
			for (NameValuePair h : headers){
				request.addHeader(h.getName(), h.getValue());
			}

			if (!params.isEmpty()){
				request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
			}

			executeRequest(request, url);
			break;
		}
		}
	}

	/**
	 * 
	 * @param request
	 * @param url
	 */
	private void executeRequest(HttpUriRequest request, String url) {
		HttpClient client = new DefaultHttpClient();

		HttpResponse httpResponse;

		try {
			httpResponse = client.execute(request);
			responseCode = httpResponse.getStatusLine().getStatusCode();
			message = httpResponse.getStatusLine().getReasonPhrase();

			HttpEntity entity = httpResponse.getEntity();

			if (entity != null) {

				InputStream instream = entity.getContent();
				response = convertStreamToString(instream);

				// Closing the input stream will trigger connection release
				instream.close();
			}

		} catch (ClientProtocolException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		}
		catch (IOException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		}
	}

	/**
	 * 
	 * @param is
	 * @return
	 */
	private static String convertStreamToString(InputStream is) {

		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try {
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} 
		catch (IOException e) {
			e.printStackTrace();
		}
		finally {
			try {
				is.close();
			}
			catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}
	
	/**
	 * 
	 * @return
	 */
	public String getResponse() {
		return response;
	}

	/**
	 * 
	 * @return
	 */
	public String getErrorMessage() {
		return message;
	}

	/**
	 * 
	 * @return
	 */
	public int getResponseCode() {
		return responseCode;
	}
}